spring集成redis

redis是一种非关系型数据库，与mongoDB不同的是redis是内存数据库，所以访问速度很快。常用作缓存和发布-订阅式的消息队列。redis官方没有提供windows版本的软件。windows版本一直是微软维护的。

下载地址：https://github.com/MSOpenTech/redis/releases。

这里是redis相关的教程。http://muxiulin.cn/archives/1197

在spring中集成redis很简单，这里用的是ssm框架+maven构建的项目。

首先是需要引入的pom.xml文件：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>SSMRedisDemo</groupId>
    <artifactId>SSMRedisDemo</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>SSMRedisDemo Maven Webapp</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <spring.version>4.2.0.RELEASE</spring.version>
    </properties>

    <dependencies>

        <!-- spring mvc related.....start --> <!-- TODO: replace jackson with fastjson -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.1.3</version>
        </dependency>
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-mapper-asl</artifactId>
            <version>1.9.13</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.6.1</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.6.1</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.6.1</version>
        </dependency>
        <!-- spring mvc related.....end -->

        <!-- mybatis orm related.....start -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.2.3</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.36</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.3.0</version>
        </dependency>
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.12</version>
        </dependency>
        <!-- mybatis orm related.....end -->

        <!-- project log related.....start -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <!-- project log related.....end -->

        <!-- redis cache related.....start -->
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-redis</artifactId>
            <version>1.6.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>2.7.3</version>
        </dependency>
        <!-- redis cache related.....end -->

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.4</version>
                <configuration>
                    <warSourceDirectory>WebContent</warSourceDirectory>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>  

项目基本架构：

jdbc.properties:

jdbc.host=127.0.0.1
jdbc.database=user
jdbc.port=3306
jdbc.username=root
jdbc.password=root

 log4j.properties:

# Global logging configuration
log4j.rootLogger=WARN,stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c:%L - %m%n
# mybatis log
log4j.logger.com.ssm.dao.UserMapper=DEBUG
# lyz log
log4j.logger.com.ssm.controller=DEBUG
log4j.logger.com.ssm.service=DEBUG

 

redis.porperties:

# Redis settings  
redis.host=127.0.0.1
redis.port=6379  
#redis.pass=password
redis.dbIndex=0  
redis.expiration=3000  
redis.maxIdle=300  
redis.maxActive=600  
redis.maxWait=1000  
redis.testOnBorrow=true

 

applicationContext.xml:

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
            http://www.springframework.org/schema/beans/spring-beans-4.0.xsd  
            http://www.springframework.org/schema/context 
            http://www.springframework.org/schema/context/spring-context-4.0.xsd  
            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd  
            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">
    <!-- class annotation related... start -->
    <context:component-scan base-package="com.ssm.serviceImpl" />
    <context:component-scan base-package="com.ssm.utils" />
    <!-- class annotation related... end -->
    <!-- mybatis related... start -->
    <bean
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:jdbc.properties</value>
                <value>classpath:redis.properties</value>
            </list>
        </property>
    </bean>
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource "
        destroy-method="close">
        <property name="driverClass" value="com.mysql.jdbc.Driver" />
        <property name="jdbcUrl"
            value="jdbc:mysql://${jdbc.host}:${jdbc.port}/${jdbc.database}?useUnicode=true&amp;characterEncoding=utf8" />
        <property name="user" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
        <property name="acquireIncrement" value="1" />
        <property name="initialPoolSize" value="5" />
        <property name="maxPoolSize" value="20" />
        <property name="minPoolSize" value="5" />
        <property name="maxStatements" value="100" />
        <property name="testConnectionOnCheckout" value="true" />
    </bean>

    <!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!-- 自动扫描mapping.xml文件 <property name="mapperLocations" value="classpath:com/ssm/mapper/*.xml"></property> -->
    </bean>

    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.ssm.dao" />
    </bean>
    <!-- mybatis related... end -->

    <!-- transaction config related... start -->
    <tx:annotation-driven transaction-manager="transactionManager" />
    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
    <!-- transaction config related... end -->

    <!-- redis config start -->
    <!-- 配置JedisPoolConfig实例 -->
    <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxIdle" value="${redis.maxIdle}" />
        <property name="maxTotal" value="${redis.maxActive}" />
        <property name="maxWaitMillis" value="${redis.maxWait}" />
        <property name="testOnBorrow" value="${redis.testOnBorrow}" />
    </bean>

    <!-- 配置JedisConnectionFactory -->
    <bean id="jedisConnectionFactory"
        class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <property name="hostName" value="${redis.host}" />
        <property name="port" value="${redis.port}" />
        <!-- <property name="password" value="${redis.pass}" /> -->
        <property name="database" value="${redis.dbIndex}" />
        <property name="poolConfig" ref="poolConfig" />
    </bean>

    <!-- 配置RedisTemplate -->
    <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
        <property name="connectionFactory" ref="jedisConnectionFactory" />
    </bean>

    <!-- 配置RedisCacheManager -->
    <bean id="redisCacheManager" class="org.springframework.data.redis.cache.RedisCacheManager">
        <constructor-arg name="redisOperations" ref="redisTemplate" />
        <property name="defaultExpiration" value="${redis.expiration}" />
    </bean>

    <!-- 配置RedisCacheConfig -->
    <bean id="redisCacheConfig" class="com.ssm.utils.RedisCacheConfig">
        <constructor-arg ref="jedisConnectionFactory" />
        <constructor-arg ref="redisTemplate" />
        <constructor-arg ref="redisCacheManager" />
    </bean>
    <!-- redis config end -->
</beans>  

 

springmvc.xml:

<?xml version="1.0" encoding="UTF-8"?>    
<beans xmlns="http://www.springframework.org/schema/beans"    
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"    
    xmlns:context="http://www.springframework.org/schema/context"    
    xmlns:mvc="http://www.springframework.org/schema/mvc"    
    xsi:schemaLocation="http://www.springframework.org/schema/beans      
                        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd      
                        http://www.springframework.org/schema/context      
                        http://www.springframework.org/schema/context/spring-context-3.1.xsd      
                        http://www.springframework.org/schema/mvc      
                        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">    
    <!-- class annotation related... start 
    <context:component-scan base-package="com.ssm.controller" />
     class annotation related... end 
     -->
     <!-- 添加注解驱动  使用注解标注的类生效-->      
    <mvc:annotation-driven />
    <!-- 设置能访问静态资源 -->    
    <mvc:default-servlet-handler/>
    <!--扫描controller-->
    <context:component-scan base-package="com.ssm.controller" />    

    <!-- jsp page related... start -->
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>
    <!-- jsp page related... end -->

    <!-- rest json related... start -->
    <bean id="mappingJacksonHttpMessageConverter"
        class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
        <property name="supportedMediaTypes">
            <list>
                <value>application/json;charset=UTF-8</value>
            </list>
        </property>
    </bean>

    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <ref bean="mappingJacksonHttpMessageConverter" />
            </list>
        </property>
    </bean>
    <!-- rest json related... end -->
</beans>  

 

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
    version="3.1">
    <display-name>Archetype Created Web Application</display-name>

    <welcome-file-list>
        <welcome-file>/index.jsp</welcome-file>
    </welcome-file-list>

    <!-- 加载spring bean -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring/applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- 编码过滤器 -->
    <filter>
        <filter-name>springfilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>springfilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- Spring MVC servlet -->
    <servlet>
        <servlet-name>SpringMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
        <async-supported>true</async-supported>
    </servlet>
    <servlet-mapping>
        <servlet-name>SpringMVC</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app> 

 

UserController:

package com.ssm.controller;

import java.util.ArrayList;
import java.util.List;
import javax.annotation.Resource;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import com.ssm.pojo.User;
import com.ssm.service.IUserService;

/**
 * user控制器
 * 
 * @author YaoQi
 */

@Controller
@RequestMapping("/UserCRUD")
public class UserController {

    @Resource
    private IUserService userService;

    /**
     * 查询所有User
     * 
     * @param request
     * @param model
     * @return
     */
    @RequestMapping(value = "/showUser", method = RequestMethod.GET)
    public String showUsers(Model model) {
        System.out.println("**********showUsers********");
        List<User> userList = new ArrayList<User>();
        userList = userService.getAllUser();
        model.addAttribute("userList", userList); // 填充数据到model
        return "showUser";
    }

    /**
     * 增加一个用户
     * 
     * @param userName
     * @param sex
     * @param age
     * @return
     */
    @RequestMapping(value = "/addUser", method = RequestMethod.POST)
    @ResponseBody
    public ModelMap addUser(String userName, String sex, int age) {
        System.out.println("******addUser********");
        System.out.println(userName + sex + age);
        User user = new User();
        user.setsex(sex);
        user.setUserName(userName);
        user.setAge(age);
        userService.insertUser(user);
        ModelMap model = new ModelMap();
        model.addAttribute("result", "添加成功");
        return model;
    }

    /**
     * 通过userID删除用户
     * 
     * @param userID
     */
    @RequestMapping(value = "/delUser/{userID}", method = RequestMethod.GET)
    public ModelAndView delUser(@PathVariable int userID) {
        System.out.println(userID);
        userService.deleteUser(userID);
        ModelAndView mv = new ModelAndView();
        List<User> userList = new ArrayList<User>();
        userList = userService.getAllUser();
        mv.addObject("userList", userList); // 填充数据到model
        mv.setViewName("showUser");
        return mv;
    }

    /**
     * 查询用户
     * 
     * @param model
     * @param keyWords
     * @return
     */
    @RequestMapping(value = "/search", method = RequestMethod.POST)
    public String findUsers(Model model, String keyWords) {
        System.out.println(keyWords);
        List<User> userList = new ArrayList<User>();
        userList = userService.findUsers(keyWords);
        model.addAttribute("userList", userList); // 填充数据到model
        return "showUser";
    }
    
    /**
     * 更新用户信息
     * @param userName
     * @param sex
     * @param age
     * @param id
     * @return
     */
    @RequestMapping(value="/editUser",method=RequestMethod.POST)
    public ModelAndView editUser(String userName, String sex, int age, int id) {
        System.out.println(userName + sex + age);
        User user = new User();
        user.setsex(sex);
        user.setUserName(userName);
        user.setAge(age);
        user.setId(id);
        userService.editUser(user);
        ModelAndView mv = new ModelAndView();
        List<User> userList = new ArrayList<User>();
        userList = userService.getAllUser();
        mv.addObject("userList", userList); // 填充数据到model
        mv.setViewName("redirect:/UserCRUD/showUser");
        return mv;
    }
}

 

User:

package com.ssm.pojo;

import java.io.Serializable;

/**
 * User实体类对应数据库中的tb_user表
 * 
 * @author YaoQi
 * 要想使用redis存对象，一定要让实体类实现Serializable接口，否则会报错。
 */
public class User implements Serializable{
    /**
     * 
     */
    private static final long serialVersionUID = -5244288298702801619L;
    private int id;
    private String userName;
    private String sex;
    private int age;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getsex() {
        return sex;
    }

    public void setsex(String sex) {
        this.sex = sex;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User [id=" + id + ", userName=" + userName + ", sex=" + sex + ", age=" + age + "]";
    }
}

 

UserMapper:

package com.ssm.dao;

import java.util.List;
import com.ssm.pojo.User;


public interface UserMapper {

    public User selectByPrimaryKey(int userId);

    public List<User> selectAllUser();

    public void insertUser(User user);

    public void deleteUser(int id);

    public List<User> findUsers(String keyWords);

    public void editUser(User user);
}

 

UserMapper.xml: 与对应的接口放到同一包下面。

<?xml version="1.0" encoding="UTF-8"?>  
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.ssm.dao.UserMapper">
    <resultMap id="BaseResultMap" type="com.ssm.pojo.User">
        <id column="id" property="id" jdbcType="INTEGER" />
        <result column="userName" property="userName" jdbcType="VARCHAR" />
        <result column="sex" property="sex" jdbcType="VARCHAR" />
        <result column="age" property="age" jdbcType="INTEGER" />
    </resultMap>
    <sql id="Base_Column_List">
        id,userName,sex,age
    </sql>
    <select id="findUsers" resultMap="BaseResultMap" parameterType="String">
        select
        <include refid="Base_Column_List" />
        from tb_user
        where id like #{keyWords}
        or userName like #{keyWords}
        or sex like #{keyWords}
        or age like #{keyWords}
    </select>

    <!-- 查询所有的user -->
    <select id="selectAllUser" resultMap="BaseResultMap">
        select
        <include refid="Base_Column_List" />
        from tb_user
    </select>

    <!-- 添加一个用户 -->
    <insert id="insertUser" parameterType="com.ssm.pojo.User">
        INSERT INTO
        tb_user(userName,sex,age) VALUES
        (#{userName},#{sex},#{age})
    </insert>

    <!-- 删除用户 -->
    <delete id="deleteUser" parameterType="int">
        DELETE FROM tb_user WHERE
        id=#{id}
    </delete>

    <!-- 更新user信息 -->
    <update id="editUser" parameterType="com.ssm.pojo.User">
        UPDATE tb_user SET
        userName=#{userName}, sex=#{sex},age=#{age} WHERE id=#{id}
    </update>
</mapper> 

 

IUserService:

package com.ssm.service;

import java.util.List;
import com.ssm.pojo.User;

/**
 * user表的操作接口
 * @author YaoQi
 */
public interface IUserService {

    /**
     * 通过id查询user接口方法
     * @param userId
     * @return
     */
     public User getUserById(int userId);  
     
     /**
      * 查询所有的user
      * @return 返回userList
      */
     public List<User> getAllUser();
     
     /**
      * 添加一个user
      * @param user
      */
     public void insertUser(User user);
     
     /**
      * 通过ID删除用户
      * @param id
      */
     public void deleteUser(int id);
     
     /**
      * 通过关键字查询用户
      * @param keyWords
      * @return
      */
     public List<User> findUsers(String keyWords);
     
     /**
      * 更新用户
      * @param user
      */
     public void editUser(User user);
}

 

ServiceImple:

package com.ssm.serviceImpl;

import java.util.List;
import javax.annotation.Resource;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import com.ssm.dao.UserMapper;
import com.ssm.pojo.User;
import com.ssm.service.IUserService;

/**
 * userService
 * 
 * 缓存机制说明：所有的查询结果都放进了缓存，也就是把MySQL查询的结果放到了redis中去，
 * 然后第二次发起该条查询时就可以从redis中去读取查询的结果，从而不与MySQL交互，从而达到优化的效果，
 * redis的查询速度之于MySQL的查询速度相当于 内存读写速度 /硬盘读写速度 
 * @Cacheable("a")注解的意义就是把该方法的查询结果放到redis中去，下一次再发起查询就去redis中去取，存在redis中的数据的key就是a；
 * @CacheEvict(value={"a","b"},allEntries=true) 的意思就是执行该方法后要清除redis中key名称为a,b的数据；
 */
@Service("userService")
@Transactional(propagation=Propagation.REQUIRED, rollbackFor=Exception.class)  
public class UserServiceImpl implements IUserService {

    @Resource
    private UserMapper iUserDao;

    @Cacheable("getUserById") //标注该方法查询的结果进入缓存，再次访问时直接读取缓存中的数据
    @Override
    public User getUserById(int userId) {
        return this.iUserDao.selectByPrimaryKey(userId);
    }

    @Cacheable("getAllUser")
    @Override
    public List<User> getAllUser() {
        return this.iUserDao.selectAllUser();
    }

    @CacheEvict(value= {"getAllUser","getUserById","findUsers"},allEntries=true)//清空缓存，allEntries变量表示所有对象的缓存都清除
    @Override
    public void insertUser(User user) {
        this.iUserDao.insertUser(user);
    }

    @CacheEvict(value= {"getAllUser","getUserById","findUsers"},allEntries=true)
    @Override
    public void deleteUser(int id) {
        this.iUserDao.deleteUser(id);
    }

    @Cacheable("findUsers")
    @Override
    public List<User> findUsers(String keyWords) {
        return iUserDao.findUsers(keyWords);
    }

    @CacheEvict(value= {"getAllUser","getUserById","findUsers"},allEntries=true)
    @Override
    public void editUser(User user) {
        this.iUserDao.editUser(user);
    }
}

 缓存主要在service层进行，查询的结果会缓存，把对象序列号存到redis中去，key就是注解中的参数，例如@Cacheable("findUsers"): 存在redis中的key就是findUsers。缓存了这个结果之后再次请求这个方法就不会去数据库中查，而是从redis缓存中读取数据，这样就减少了跟数据库之间的交互。然后修改、删除、增加操作就会清除缓存，保持数据的一致性。

 

RedisCacheConfig: 需要增加这个配置类，会在applicationContex配置文件中注册这个bean。

package com.ssm.utils;

import java.lang.reflect.Method;

import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;

/**
 * 通过spring管理redis缓存配置
 * 
 * @author Administrator
 *
 */
@Configuration  
@EnableCaching 
public class RedisCacheConfig extends CachingConfigurerSupport {
    private volatile JedisConnectionFactory jedisConnectionFactory;
    private volatile RedisTemplate<String, String> redisTemplate;
    private volatile RedisCacheManager redisCacheManager;

    public RedisCacheConfig() {
        super();
    }

    /**
     * 带参数的构造方法 初始化所有的成员变量
     * 
     * @param jedisConnectionFactory
     * @param redisTemplate
     * @param redisCacheManager
     */
    public RedisCacheConfig(JedisConnectionFactory jedisConnectionFactory, RedisTemplate<String, String> redisTemplate,
            RedisCacheManager redisCacheManager) {
        this.jedisConnectionFactory = jedisConnectionFactory;
        this.redisTemplate = redisTemplate;
        this.redisCacheManager = redisCacheManager;
    }

    public JedisConnectionFactory getJedisConnecionFactory() {
        return jedisConnectionFactory;
    }

    public RedisTemplate<String, String> getRedisTemplate() {
        return redisTemplate;
    }

    public RedisCacheManager getRedisCacheManager() {
        return redisCacheManager;
    }

    @Bean
    public KeyGenerator customKeyGenerator() {
        return new KeyGenerator() {
            @Override
            public Object generate(Object target, Method method, Object... objects) {
                StringBuilder sb = new StringBuilder();
                sb.append(target.getClass().getName());
                sb.append(method.getName());
                for (Object obj : objects) {
                    sb.append(obj.toString());
                }
                return sb.toString();
            }
        };
    }
}